噪声与振动控制
譟聲與振動控製
조성여진동공제
NOISE AND VIBRATION CONTROL
2014年
4期
214-218
,共5页
振动与波%高速铁路%高架结构%钢轨吸振器%耦合振动%动柔度
振動與波%高速鐵路%高架結構%鋼軌吸振器%耦閤振動%動柔度
진동여파%고속철로%고가결구%강궤흡진기%우합진동%동유도
vibration and wave%high speed railway%elevated railway%rail vibration absorber%coupled vibration%dynamic flexibility function
建立带有钢轨吸振器的高速铁路高架结构板式轨道与桥梁垂向耦合振动模型，分析钢轨吸振器对轨道和桥梁结构垂向振动的影响。模型已考虑了钢轨吸振器、板式轨道结构及桥梁间的耦合作用。钢轨吸振器被视为两自由度的质量-弹簧系统，钢轨、轨道板和桥梁被视为多层叠合梁模型，彼此用弹簧阻尼元件联接。利用动柔度函数，得到吸振器-板式轨道-桥梁系统垂向振动响应的解析表达式，并以轮轨表面粗糙度谱作为激励求解模型的振动响应。研究结果表明：钢轨吸振器在180 Hz～300 Hz及700 Hz～1000 Hz频段内对整个高架轨道系统的位移幅值及相位、振动衰减产生较明显的影响；同时，在轮轨表面粗糙度谱的激励下，带有钢轨吸振器的轮轨系统的轮轨力在pinned-pinned频率处明显减小，在前两阶自振主频附近钢轨吸振器对整个高架轨道系统结构振动的影响较明显。
建立帶有鋼軌吸振器的高速鐵路高架結構闆式軌道與橋樑垂嚮耦閤振動模型，分析鋼軌吸振器對軌道和橋樑結構垂嚮振動的影響。模型已攷慮瞭鋼軌吸振器、闆式軌道結構及橋樑間的耦閤作用。鋼軌吸振器被視為兩自由度的質量-彈簧繫統，鋼軌、軌道闆和橋樑被視為多層疊閤樑模型，彼此用彈簧阻尼元件聯接。利用動柔度函數，得到吸振器-闆式軌道-橋樑繫統垂嚮振動響應的解析錶達式，併以輪軌錶麵粗糙度譜作為激勵求解模型的振動響應。研究結果錶明：鋼軌吸振器在180 Hz～300 Hz及700 Hz～1000 Hz頻段內對整箇高架軌道繫統的位移幅值及相位、振動衰減產生較明顯的影響；同時，在輪軌錶麵粗糙度譜的激勵下，帶有鋼軌吸振器的輪軌繫統的輪軌力在pinned-pinned頻率處明顯減小，在前兩階自振主頻附近鋼軌吸振器對整箇高架軌道繫統結構振動的影響較明顯。
건립대유강궤흡진기적고속철로고가결구판식궤도여교량수향우합진동모형，분석강궤흡진기대궤도화교량결구수향진동적영향。모형이고필료강궤흡진기、판식궤도결구급교량간적우합작용。강궤흡진기피시위량자유도적질량-탄황계통，강궤、궤도판화교량피시위다층첩합량모형，피차용탄황조니원건련접。이용동유도함수，득도흡진기-판식궤도-교량계통수향진동향응적해석표체식，병이륜궤표면조조도보작위격려구해모형적진동향응。연구결과표명：강궤흡진기재180 Hz～300 Hz급700 Hz～1000 Hz빈단내대정개고가궤도계통적위이폭치급상위、진동쇠감산생교명현적영향；동시，재륜궤표면조조도보적격려하，대유강궤흡진기적륜궤계통적륜궤력재pinned-pinned빈솔처명현감소，재전량계자진주빈부근강궤흡진기대정개고가궤도계통결구진동적영향교명현。
The frequency-domain analysis model with a rail vibration absorber is established for analyzing the elevated slab-track and track-bridge coupled vertical vibration. The effect of the rail vibration absorber on the vertical vibrations of elevated railway and bridge is analyzed. The coupling effect of the absorber, rail, slab track and elevated bridge is considered. The absorber is modeled to be a mass-spring system with two degrees of freedom. The rail, slab track and elevated bridge are respectively considered as an infinitely long Timoshenko beam, an end-free Euler beam and a simply supported Euler beam, and they are connected one another with spring and damping elements. The vertical vibrations of the system are solved by dynamic flexibility functions. The effect of the absorber on the vertical vibration of the elevated railway is analyzed, and the vibrations of the elevated railway structures excited by the wheel-rail roughness spectra are obtained. The results show that, the absorber has a significant effect on the vibration decay and displacement amplitude and phase of the whole structures of the elevated railway in the frequency ranges of 180 Hz~300 Hz and 700 Hz~1 000 Hz. Under the excitation of wheel/rail roughness spectra, the absorber can reduce the wheel/rail force obviously at the“pinned-pinned”frequency of the rail and has an obvious effect on the whole structure of the elevated railway around its first and second order natural frequencies.
